The density of states for germanium (diamond structure) was calculated using the program Quantum Espresso (version 5.3.0).
The parameters for GaP were taken from the following sites:
The calculated bandgap has a value of about 0.19 eV in comparison to a measured value of 0.661 eV (cf. reference value). The plot was not adjusted to the right bandgap.
E [eV] D(E) [unitcell-1eV-1]